Answer with Explanation:
Although senators were elected by the state legislatures until 1913, Douglas and Lincoln took their arguments directly to the people. The timing of the campaign, the context of sectional animosity within which it was fought, the volatility of the slavery issue, and the instability of the party system combined to give the debates a special importance. Not long before, Douglas had defied President James Buchanan and the southern Democratic leadership when he opposed the admission of Kansas as a slave state under the controversial Lecompton constitution, a stand for which he received support from Republicans in Congress as well as their interest in his reelection. At the same time, Buchanan and the southern slave interests gave tacit (and in some instances explicit) support to Lincoln’s candidacy because of their hostility to Douglas. As a result of this strange alignment, Lincoln’s principal task was to keep Illinois Republicans from supporting Douglas by exposing the moral gulf that separated them from the senator and to win the support of radical abolitionists and former conservative Whigs. A relative newcomer to the antislavery cause (before 1854, he said, slavery had been a “minor question” with him), Lincoln used the debates to develop and strengthen the moral quality of his position.
On election day, the voters of Illinois chose members of the state legislature who in turn reelected Douglas to the Senate in January 1859. Although Lincoln lost, the Republicans received more popular votes than the Democrats, signaling an important shift in the political character of the state. Moreover, Lincoln had gained a reputation throughout the North. He was invited to campaign for Republican candidates in other states and was now mentioned as a candidate for the presidency. In winning, Douglas further alienated the Buchanan administration and the South, was soon to be stripped of his power in the Senate, and contributed to the division of the Democratic party.